地震行波输入下连续梁桥支承长度的参数分析
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摘要
根据多跨连续梁桥的主要结构特点,提出了地震行波效应分析的多跨连续梁桥分析模型.采用绝对位移法建立多点输入的运动平衡方程,并应用非线性时程方法对行波输入下地震反应的支承长度进行了参数分析.结果表明:系统的基本周期大小、滑动支座摩阻系数、过渡墩的基本周期以及行波输入延时对地震反应的支承长度有重要影响;同时考虑行波效应的多点输入与地震动一致输入的计算结果有较大的差别,行波效应会使墩梁相对位移明显增大,相应地也增大了地震作用下支承长度的需求.
Based on the key dynamic characteristics of multi-span continuous bridges,a simplified analytical model was adopted to study the effects of traveling waves.Using the absolute displacement method,the equilibrium equation of motion was established.Then,effects,such as those of the value of natural periods,coefficient of friction,the period of the transitional pier and time lag were discussed with the nonlinear time-history analysis method under the longitudinal excitation of traveling waves.The results have shown that the relative displacements between adjacent bridge piers and girders increase significantly,considering the effects of traveling waves,and accordingly,the required seating length increases.
Based on the key dynamic characteristics of multi-span continuous bridges,a simplified analytical model was adopted to study the effects of traveling waves.Using the absolute displacement method,the equilibrium equation of motion was established.Then,effects,such as those of the value of natural periods,coefficient of friction,the period of the transitional pier and time lag were discussed with the nonlinear time-history analysis method under the longitudinal excitation of traveling waves.The results have shown that the relative displacements between adjacent bridge piers and girders increase significantly,considering the effects of traveling waves,and accordingly,the required seating length increases.
引文
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[8]CALTRANS.Seismic design criteria version 1.2[M].California:Business Transportation and Housing Agency,2001.
[2]ROBERT J,KRZYSZTOF W,YOZO F.Reduction of poundingeffects in elevated bridges during earthquakes[J].Earthquake En-gineering and Structural Dynamics,2000,29:195-212.
[3]PRIESTLEY M J N,SEIBLE F,GALVI G M.Seismic designand retrofit of bridge[M].New York:Jonhn Wiley&Sons Inc,1996.
[4]RUANGRASSAMEE A,KAWASHIMA K.Relative displace-ment response spectra with pounding effect[J].Earthquake Engi-neering and Structural Dynamics,2001,30:1511-1538.
[5]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.WANG J W,ZHANG Y B,LI J Z,et al.Seismic wave passageeffect's influences on longitudinal seismic pounding response forcontinuous girder bridges[J].Engineering Mechanics,2007,24(11):100-105.(In Chinese)
[6]李忠献,史志利.行波激励下大跨度连续刚构桥的地震反应分析[J].地震工程与工程振动,2003,23(2):68-76.LI Z X,SHI Z L.Seismic response analysis for long-span contin-uous rigid-framed bridges under excitation of traveling waves[J].Earthquake Engineering and Engineering Vibration,2003,23(2):68-76.(In Chinese)
[7]EDWARD L W.Three-dimensional static and dynamic analysis ofstructures[M].California:Computers ond Structures Inc,2002.
[8]CALTRANS.Seismic design criteria version 1.2[M].California:Business Transportation and Housing Agency,2001.
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